Jonathan Piat / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_STM32F0/spi_api.c@552:a1b9575155a3, 2015-05-27 (annotated)

Committer:
mbed_official
Date:
Wed May 27 13:30:08 2015 +0100
Revision:
552:a1b9575155a3
Parent:
469:fc4922e0c183 
Synchronized with git revision a74a8f14fd8c4bf3dc09980c4bf9498ebcf4c207



Full URL: https://github.com/mbedmicro/mbed/commit/a74a8f14fd8c4bf3dc09980c4bf9498ebcf4c207/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 441:d2c15dda23c1 1 /* mbed Microcontroller Library
mbed_official 441:d2c15dda23c1 2 *******************************************************************************
mbed_official 441:d2c15dda23c1 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 441:d2c15dda23c1 4 * All rights reserved.
mbed_official 441:d2c15dda23c1 5 *
mbed_official 441:d2c15dda23c1 6 * Redistribution and use in source and binary forms, with or without
mbed_official 441:d2c15dda23c1 7 * modification, are permitted provided that the following conditions are met:
mbed_official 441:d2c15dda23c1 8 *
mbed_official 441:d2c15dda23c1 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 441:d2c15dda23c1 10 * this list of conditions and the following disclaimer.
mbed_official 441:d2c15dda23c1 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 441:d2c15dda23c1 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 441:d2c15dda23c1 13 * and/or other materials provided with the distribution.
mbed_official 441:d2c15dda23c1 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 441:d2c15dda23c1 15 * may be used to endorse or promote products derived from this software
mbed_official 441:d2c15dda23c1 16 * without specific prior written permission.
mbed_official 441:d2c15dda23c1 17 *
mbed_official 441:d2c15dda23c1 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 441:d2c15dda23c1 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 441:d2c15dda23c1 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 441:d2c15dda23c1 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 441:d2c15dda23c1 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 441:d2c15dda23c1 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 441:d2c15dda23c1 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 441:d2c15dda23c1 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 441:d2c15dda23c1 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 441:d2c15dda23c1 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 441:d2c15dda23c1 28 *******************************************************************************
mbed_official 441:d2c15dda23c1 29 */
mbed_official 441:d2c15dda23c1 30 #include "mbed_assert.h"
mbed_official 441:d2c15dda23c1 31 #include "spi_api.h"
mbed_official 441:d2c15dda23c1 32
mbed_official 441:d2c15dda23c1 33 #if DEVICE_SPI
mbed_official 441:d2c15dda23c1 34
mbed_official 441:d2c15dda23c1 35 #include <math.h>
mbed_official 441:d2c15dda23c1 36 #include "cmsis.h"
mbed_official 441:d2c15dda23c1 37 #include "pinmap.h"
mbed_official 441:d2c15dda23c1 38 #include "PeripheralPins.h"
mbed_official 441:d2c15dda23c1 39
mbed_official 441:d2c15dda23c1 40 static SPI_HandleTypeDef SpiHandle;
mbed_official 441:d2c15dda23c1 41
mbed_official 441:d2c15dda23c1 42 static void init_spi(spi_t *obj)
mbed_official 441:d2c15dda23c1 43 {
mbed_official 441:d2c15dda23c1 44 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 45
mbed_official 441:d2c15dda23c1 46 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 441:d2c15dda23c1 47
mbed_official 441:d2c15dda23c1 48 SpiHandle.Init.Mode = obj->mode;
mbed_official 441:d2c15dda23c1 49 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 441:d2c15dda23c1 50 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 441:d2c15dda23c1 51 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 441:d2c15dda23c1 52 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 441:d2c15dda23c1 53 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 441:d2c15dda23c1 54 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 441:d2c15dda23c1 55 SpiHandle.Init.DataSize = obj->bits;
mbed_official 441:d2c15dda23c1 56 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 441:d2c15dda23c1 57 SpiHandle.Init.NSS = obj->nss;
mbed_official 441:d2c15dda23c1 58 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 441:d2c15dda23c1 59
mbed_official 441:d2c15dda23c1 60 HAL_SPI_Init(&SpiHandle);
mbed_official 441:d2c15dda23c1 61
mbed_official 441:d2c15dda23c1 62 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 441:d2c15dda23c1 63 }
mbed_official 441:d2c15dda23c1 64
mbed_official 441:d2c15dda23c1 65 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
mbed_official 441:d2c15dda23c1 66 {
mbed_official 441:d2c15dda23c1 67 // Determine the SPI to use
mbed_official 441:d2c15dda23c1 68 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 441:d2c15dda23c1 69 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 441:d2c15dda23c1 70 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 441:d2c15dda23c1 71 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 441:d2c15dda23c1 72
mbed_official 441:d2c15dda23c1 73 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 441:d2c15dda23c1 74 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 441:d2c15dda23c1 75
mbed_official 441:d2c15dda23c1 76 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 441:d2c15dda23c1 77 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 441:d2c15dda23c1 78
mbed_official 441:d2c15dda23c1 79 // Enable SPI clock
mbed_official 441:d2c15dda23c1 80 if (obj->spi == SPI_1) {
mbed_official 441:d2c15dda23c1 81 __SPI1_CLK_ENABLE();
mbed_official 441:d2c15dda23c1 82 }
mbed_official 441:d2c15dda23c1 83 if (obj->spi == SPI_2) {
mbed_official 441:d2c15dda23c1 84 __SPI2_CLK_ENABLE();
mbed_official 441:d2c15dda23c1 85 }
mbed_official 441:d2c15dda23c1 86
mbed_official 441:d2c15dda23c1 87 // Configure the SPI pins
mbed_official 441:d2c15dda23c1 88 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 441:d2c15dda23c1 89 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 441:d2c15dda23c1 90 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 441:d2c15dda23c1 91
mbed_official 441:d2c15dda23c1 92 // Save new values
mbed_official 441:d2c15dda23c1 93 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 441:d2c15dda23c1 94 obj->cpol = SPI_POLARITY_LOW;
mbed_official 441:d2c15dda23c1 95 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 441:d2c15dda23c1 96 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 441:d2c15dda23c1 97
mbed_official 441:d2c15dda23c1 98 obj->pin_miso = miso;
mbed_official 441:d2c15dda23c1 99 obj->pin_mosi = mosi;
mbed_official 441:d2c15dda23c1 100 obj->pin_sclk = sclk;
mbed_official 441:d2c15dda23c1 101 obj->pin_ssel = ssel;
mbed_official 441:d2c15dda23c1 102
mbed_official 552:a1b9575155a3 103 if (ssel != NC) {
mbed_official 552:a1b9575155a3 104 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 552:a1b9575155a3 105 } else {
mbed_official 441:d2c15dda23c1 106 obj->nss = SPI_NSS_SOFT;
mbed_official 441:d2c15dda23c1 107 }
mbed_official 441:d2c15dda23c1 108
mbed_official 441:d2c15dda23c1 109 init_spi(obj);
mbed_official 441:d2c15dda23c1 110 }
mbed_official 441:d2c15dda23c1 111
mbed_official 441:d2c15dda23c1 112 void spi_free(spi_t *obj)
mbed_official 441:d2c15dda23c1 113 {
mbed_official 441:d2c15dda23c1 114 // Reset SPI and disable clock
mbed_official 441:d2c15dda23c1 115 if (obj->spi == SPI_1) {
mbed_official 441:d2c15dda23c1 116 __SPI1_FORCE_RESET();
mbed_official 441:d2c15dda23c1 117 __SPI1_RELEASE_RESET();
mbed_official 441:d2c15dda23c1 118 __SPI1_CLK_DISABLE();
mbed_official 441:d2c15dda23c1 119 }
mbed_official 441:d2c15dda23c1 120
mbed_official 441:d2c15dda23c1 121 if (obj->spi == SPI_2) {
mbed_official 441:d2c15dda23c1 122 __SPI2_FORCE_RESET();
mbed_official 441:d2c15dda23c1 123 __SPI2_RELEASE_RESET();
mbed_official 441:d2c15dda23c1 124 __SPI2_CLK_DISABLE();
mbed_official 441:d2c15dda23c1 125 }
mbed_official 441:d2c15dda23c1 126
mbed_official 441:d2c15dda23c1 127 // Configure GPIOs
mbed_official 441:d2c15dda23c1 128 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 441:d2c15dda23c1 129 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 441:d2c15dda23c1 130 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 441:d2c15dda23c1 131 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 441:d2c15dda23c1 132 }
mbed_official 441:d2c15dda23c1 133
mbed_official 441:d2c15dda23c1 134 void spi_format(spi_t *obj, int bits, int mode, int slave)
mbed_official 441:d2c15dda23c1 135 {
mbed_official 441:d2c15dda23c1 136 // Save new values
mbed_official 441:d2c15dda23c1 137 if (bits == 16) {
mbed_official 441:d2c15dda23c1 138 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 441:d2c15dda23c1 139 } else {
mbed_official 441:d2c15dda23c1 140 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 441:d2c15dda23c1 141 }
mbed_official 441:d2c15dda23c1 142
mbed_official 441:d2c15dda23c1 143 switch (mode) {
mbed_official 441:d2c15dda23c1 144 case 0:
mbed_official 441:d2c15dda23c1 145 obj->cpol = SPI_POLARITY_LOW;
mbed_official 441:d2c15dda23c1 146 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 441:d2c15dda23c1 147 break;
mbed_official 441:d2c15dda23c1 148 case 1:
mbed_official 441:d2c15dda23c1 149 obj->cpol = SPI_POLARITY_LOW;
mbed_official 441:d2c15dda23c1 150 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 441:d2c15dda23c1 151 break;
mbed_official 441:d2c15dda23c1 152 case 2:
mbed_official 441:d2c15dda23c1 153 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 441:d2c15dda23c1 154 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 441:d2c15dda23c1 155 break;
mbed_official 441:d2c15dda23c1 156 default:
mbed_official 441:d2c15dda23c1 157 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 441:d2c15dda23c1 158 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 441:d2c15dda23c1 159 break;
mbed_official 441:d2c15dda23c1 160 }
mbed_official 441:d2c15dda23c1 161
mbed_official 552:a1b9575155a3 162 if (obj->nss != SPI_NSS_SOFT) {
mbed_official 552:a1b9575155a3 163 obj->nss = (slave) ? SPI_NSS_HARD_INPUT : SPI_NSS_HARD_OUTPUT;
mbed_official 441:d2c15dda23c1 164 }
mbed_official 441:d2c15dda23c1 165
mbed_official 552:a1b9575155a3 166 obj->mode = (slave) ? SPI_MODE_SLAVE : SPI_MODE_MASTER;
mbed_official 552:a1b9575155a3 167
mbed_official 441:d2c15dda23c1 168 init_spi(obj);
mbed_official 441:d2c15dda23c1 169 }
mbed_official 441:d2c15dda23c1 170
mbed_official 441:d2c15dda23c1 171 void spi_frequency(spi_t *obj, int hz)
mbed_official 441:d2c15dda23c1 172 {
mbed_official 441:d2c15dda23c1 173 // Note: The frequencies are obtained with SPI clock = 48 MHz (APB clock)
mbed_official 441:d2c15dda23c1 174 if (hz < 375000) {
mbed_official 441:d2c15dda23c1 175 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 188 kHz
mbed_official 441:d2c15dda23c1 176 } else if ((hz >= 375000) && (hz < 750000)) {
mbed_official 441:d2c15dda23c1 177 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz
mbed_official 441:d2c15dda23c1 178 } else if ((hz >= 750000) && (hz < 1000000)) {
mbed_official 441:d2c15dda23c1 179 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 750 kHz
mbed_official 441:d2c15dda23c1 180 } else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 441:d2c15dda23c1 181 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz
mbed_official 441:d2c15dda23c1 182 } else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 441:d2c15dda23c1 183 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz
mbed_official 441:d2c15dda23c1 184 } else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 441:d2c15dda23c1 185 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz
mbed_official 441:d2c15dda23c1 186 } else if ((hz >= 12000000) && (hz < 24000000)) {
mbed_official 441:d2c15dda23c1 187 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz
mbed_official 441:d2c15dda23c1 188 } else { // >= 24000000
mbed_official 441:d2c15dda23c1 189 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz
mbed_official 441:d2c15dda23c1 190 }
mbed_official 441:d2c15dda23c1 191
mbed_official 441:d2c15dda23c1 192 init_spi(obj);
mbed_official 441:d2c15dda23c1 193 }
mbed_official 441:d2c15dda23c1 194
mbed_official 441:d2c15dda23c1 195 static inline int ssp_readable(spi_t *obj)
mbed_official 441:d2c15dda23c1 196 {
mbed_official 441:d2c15dda23c1 197 int status;
mbed_official 441:d2c15dda23c1 198 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 199 // Check if data is received
mbed_official 441:d2c15dda23c1 200 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 441:d2c15dda23c1 201 return status;
mbed_official 441:d2c15dda23c1 202 }
mbed_official 441:d2c15dda23c1 203
mbed_official 441:d2c15dda23c1 204 static inline int ssp_writeable(spi_t *obj)
mbed_official 441:d2c15dda23c1 205 {
mbed_official 441:d2c15dda23c1 206 int status;
mbed_official 441:d2c15dda23c1 207 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 208 // Check if data is transmitted
mbed_official 441:d2c15dda23c1 209 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 441:d2c15dda23c1 210 return status;
mbed_official 441:d2c15dda23c1 211 }
mbed_official 441:d2c15dda23c1 212
mbed_official 441:d2c15dda23c1 213 static inline void ssp_write(spi_t *obj, int value)
mbed_official 441:d2c15dda23c1 214 {
mbed_official 441:d2c15dda23c1 215 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 216 while (!ssp_writeable(obj));
mbed_official 441:d2c15dda23c1 217 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 441:d2c15dda23c1 218 // Force 8-bit access to the data register
mbed_official 441:d2c15dda23c1 219 uint8_t *p_spi_dr = 0;
mbed_official 441:d2c15dda23c1 220 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 441:d2c15dda23c1 221 *p_spi_dr = (uint8_t)value;
mbed_official 441:d2c15dda23c1 222 } else { // SPI_DATASIZE_16BIT
mbed_official 441:d2c15dda23c1 223 spi->DR = (uint16_t)value;
mbed_official 441:d2c15dda23c1 224 }
mbed_official 441:d2c15dda23c1 225 }
mbed_official 441:d2c15dda23c1 226
mbed_official 441:d2c15dda23c1 227 static inline int ssp_read(spi_t *obj)
mbed_official 441:d2c15dda23c1 228 {
mbed_official 441:d2c15dda23c1 229 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 230 while (!ssp_readable(obj));
mbed_official 441:d2c15dda23c1 231 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 441:d2c15dda23c1 232 // Force 8-bit access to the data register
mbed_official 441:d2c15dda23c1 233 uint8_t *p_spi_dr = 0;
mbed_official 441:d2c15dda23c1 234 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 441:d2c15dda23c1 235 return (int)(*p_spi_dr);
mbed_official 441:d2c15dda23c1 236 } else {
mbed_official 441:d2c15dda23c1 237 return (int)spi->DR;
mbed_official 441:d2c15dda23c1 238 }
mbed_official 441:d2c15dda23c1 239 }
mbed_official 441:d2c15dda23c1 240
mbed_official 441:d2c15dda23c1 241 static inline int ssp_busy(spi_t *obj)
mbed_official 441:d2c15dda23c1 242 {
mbed_official 441:d2c15dda23c1 243 int status;
mbed_official 441:d2c15dda23c1 244 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 245 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 441:d2c15dda23c1 246 return status;
mbed_official 441:d2c15dda23c1 247 }
mbed_official 441:d2c15dda23c1 248
mbed_official 441:d2c15dda23c1 249 int spi_master_write(spi_t *obj, int value)
mbed_official 441:d2c15dda23c1 250 {
mbed_official 441:d2c15dda23c1 251 ssp_write(obj, value);
mbed_official 441:d2c15dda23c1 252 return ssp_read(obj);
mbed_official 441:d2c15dda23c1 253 }
mbed_official 441:d2c15dda23c1 254
mbed_official 441:d2c15dda23c1 255 int spi_slave_receive(spi_t *obj)
mbed_official 441:d2c15dda23c1 256 {
mbed_official 441:d2c15dda23c1 257 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 441:d2c15dda23c1 258 };
mbed_official 441:d2c15dda23c1 259
mbed_official 441:d2c15dda23c1 260 int spi_slave_read(spi_t *obj)
mbed_official 441:d2c15dda23c1 261 {
mbed_official 441:d2c15dda23c1 262 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 263 while (!ssp_readable(obj));
mbed_official 441:d2c15dda23c1 264 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 441:d2c15dda23c1 265 // Force 8-bit access to the data register
mbed_official 441:d2c15dda23c1 266 uint8_t *p_spi_dr = 0;
mbed_official 441:d2c15dda23c1 267 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 441:d2c15dda23c1 268 return (int)(*p_spi_dr);
mbed_official 441:d2c15dda23c1 269 } else {
mbed_official 441:d2c15dda23c1 270 return (int)spi->DR;
mbed_official 441:d2c15dda23c1 271 }
mbed_official 441:d2c15dda23c1 272 }
mbed_official 441:d2c15dda23c1 273
mbed_official 441:d2c15dda23c1 274 void spi_slave_write(spi_t *obj, int value)
mbed_official 441:d2c15dda23c1 275 {
mbed_official 441:d2c15dda23c1 276 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 277 while (!ssp_writeable(obj));
mbed_official 441:d2c15dda23c1 278 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 441:d2c15dda23c1 279 // Force 8-bit access to the data register
mbed_official 441:d2c15dda23c1 280 uint8_t *p_spi_dr = 0;
mbed_official 441:d2c15dda23c1 281 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 441:d2c15dda23c1 282 *p_spi_dr = (uint8_t)value;
mbed_official 441:d2c15dda23c1 283 } else { // SPI_DATASIZE_16BIT
mbed_official 441:d2c15dda23c1 284 spi->DR = (uint16_t)value;
mbed_official 441:d2c15dda23c1 285 }
mbed_official 441:d2c15dda23c1 286 }
mbed_official 441:d2c15dda23c1 287
mbed_official 441:d2c15dda23c1 288 int spi_busy(spi_t *obj)
mbed_official 441:d2c15dda23c1 289 {
mbed_official 441:d2c15dda23c1 290 return ssp_busy(obj);
mbed_official 441:d2c15dda23c1 291 }
mbed_official 441:d2c15dda23c1 292
mbed_official 441:d2c15dda23c1 293 #endif